Moving Configuration Data Between DHCP Servers (Task Map)

DHCP Manager and the dhcpconfig utility enable you to move some or all
the DHCP configuration data from one DHCP server to another server. You can
move entire networks and all the IP addresses, macros, and options associated with
the networks. Alternatively, you can select specific IP addresses, macros, and options to
move. You can also copy macros and options without removing the macros and
options from the first server.

You might want to move data if you are going to do
any of the following tasks:

Add a server to share DHCP duties.

Replace the DHCP server's system.

Change the path for the data store, while still using the same data store.

The following task map identifies the procedures that you must perform when you move
DHCP configuration data. The map includes links to procedures to perform the tasks.

Task

Description

For
Instructions

1. Export the data from the first server.

Select the data that you
want to move to another server, and create a file of exported data.

In DHCP Manager, you use the Export Data wizard and the Import
Data wizard to move the data from one server to the other server.
You then modify macros in the Macros tab. The following figures show the
initial dialog boxes for the wizards.

Figure 15-20 Export Data Wizard Dialog Box in DHCP Manager

Figure 15-21 Import Data Wizard Dialog Box in DHCP Manager

How to Export Data From a DHCP Server (DHCP Manager)

Start DHCP Manager on the server from which you want to move or
copy data.

To export specific addresses, macros, and options, type a command that uses the
following format:

# dhcpconfig -Xfilename-anetwork-addresses-mmacros-ooptions

filename is the full path name that you want to use to store
the compressed exported data. You specify particular network addresses, DHCP macros, and DHCP
options in comma-separated lists. The following example shows how to export specific networks,
macros, and options.

filename is the full path name that you want to use to store
the compressed exported data. The keyword ALL can be used with the command
options to export all the network addresses, macros, or options. The following example
shows how to use the ALL keyword.

# dhcpconfig -X /var/dhcp/dhcp1065_data -a ALL -m ALL -o ALL

Tip - You can omit the export of a particular kind of data by
not specifying the dhcpconfig command option for that type of data. For example, if
you do not specify the -m option, no DHCP macros are exported.

See the dhcpconfig(1M) man page for more information about the dhcpconfig command.

Move the export file to a location that is accessible to the server
that must import the data.

For example, if you moved networks, you must open the Addresses tab and
change the owning server of addresses in the imported networks. You might also
need to open the Macros tab to specify the correct domain names for
NIS, NIS+ or DNS in some macros.

Open the Addresses, tab and select a network that you imported.

To select all the addresses, click the first address, press and hold the
Shift key, and click the last address.

From the Edit menu, choose Properties.

The Modify Multiple Addresses dialog box opens.

At the Managing Server prompt, select the new server's name.

At the Configuration Macro prompt, select the macro that should be used for
all clients on this network, and then click OK.

Open the Macros tab.

Use the Find button to locate the options that are likely to need
modified values.

The Find button is located at the bottom of the window.

DNSdmain, DNSserv, NISservs, NIS+serv, and NISdmain are examples of options that might need
modification on the new server.

If you moved networks, use the pntadm -Pnetwork-address command to print out the
network tables for the networks you moved.

Modify IP address information by using the pntadm command.

You might need to change the owning server and the configuration macro for
imported addresses. For example, to change the owning server (10.60.3.4) and macro (dhcpsrv-1060) for
address 10.63.0.2, you would use the following command:

pntadm -M 10.63.0.2 -s 10.60.3.4 -m dhcpsrv-1060 10.60.0.0

If you have a large number of addresses, you should create a
script file that contains commands to modify each address. Execute the script with the
pntadm -B command, which runs pntadm in batch mode. See the pntadm(1M) man page.

Examine the dhcptab macros for options with values that need modification.

Use the dhtadm -P command to print the entire dhcptab table to your screen.
Use grep or some other tool to search for options or values that
you might want to change.

Modify options in macros, if necessary, by using the dhtadm -M command.

For example, you might need to modify some macros to specify the correct
domain names and servers for NIS, NIS+ or DNS. For example, the following command
changes the values of DNSdmain and DNSserv in the macro mymacro: